Improvement in screens for coal-gas purifiers



JOHN HALE.

improvement in Screen for Coal-Gas Purifiers;

Fig.1.

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Patented June 18, 1872.

I screen.

'U'Nirnn STATES PATENT QFFICE'.

JOHN HALE, OF GEORGETOWN, MASSACHUSETTS.

IMPROVEMENT IN SCREENS FOR COAL-GAS PURIFIERS.

Specification forming part of Letters Patent No. 127,973, dated June 18, 1872.

with three screens constructed in accordance with my invention and ready for use. Fig. 2 is an end elevation of one of the screens, and Fig. 3 a side elevation thereof.

My invention has reference to that class of screens in which dry lime is used as the purifying agent, such screens being employed in the ordinary gas-purifyin g boxes, and arranged in tiers, one above another each of such boxes being provided with a cover for the insertion and removal of the screens when desirable, and being connected with the body portion by a hydraulic seal. \Vhen in use, the gas is led from the hydraulic main by means of an induction-pipe into the lower part of the box, and, passing upward through the series of lime-charged screens into the upper part of the said box, is conveyed from thence by an ed uction-pipe to the station-meter. The object of my invention is to provide a simple, cheap, and durable screenone which can be readily adapted to fit boxes differing either in length or breadth, or both; and my invention consists in the peculiar construction and arrangement of the parts, as hereinafter fully described.

In the said drawing,A A denote two wooden bars, constituting the frame-work of the Through each of these bars, and transversely thereof, a series of round or other suitably shaped holes, a, is made. I) b, &c., are a series of cylindrical bars or rods, which are disposed at a short distance apart and so as to leave openings between them, such rods extending longitudinally across and through the holes in the said frame. B is a bar, which is disposed midway between the bars A A, such being used, when the boxes are long or wide, to prevent sagging or warping of the rods, and thereby retain them in their normal position. A

The diameter of the rods corresponds with that of the holes through which they are to pass, so that, in case the screen may be of greater length than the frame or box for which it is intended, one of the has A or A may be moved toward the other the requisite distance, and the projecting ends of the rods sawed off, when the two outer rods may be pinned at their ends to the bars A A. Should the width of the screen in the opposite direction be too great we have simply to portion of lime, and therebfthe joint become better sealed than if such ends were formed plain and parallel.

Furthermore, each of the outer vertical faces of the bars AA may be plain, but I prefer to make them of a curvilinear or convex shape; or they may be rabbeted or formed with two grooves, c c, as shown in Fig. 3 the object of such conformation being to enable the bars to receive a larger or thicker mass of lime, and better retain the same over the openings between the frames, than if they were formed with parallel sides.

The screen is so constructed that it is reversible, either side being used uppermost with equal advantage.

From the above it will be seen that by my peculiar construction and arrangement ofparts I produce not only a simple, strong, and durable screen, but one which can be readily adapted to any-sized gas-purifying box.

I do not claim the invention as shown and described in Letters Patent No. 108,167, nor those shown in patents numbered 72,455 and 36,752, and reissue No. 1,389, as my invention differs therefrom.

Having described my invention, what I claim The improved reversible screen as described, the same consisting of the bars A A, or A A and B, and the series of rods a a, &c., constructed, combined, and arranged together in the manner and for the purpose set forth.

Witnesses: JOHN HALE.

F. P. HALE, F. O. HALE. 

